This vintage AOPA AIR-AID Navigation Rulers set from 1973 and 1975 is a must-have for aviation enthusiasts and collectors alike. With intricate details and precise measurements, this set allows for accurate navigation and information gathering during flights. The rulers are in great working condition and are sure to make a great addition to any collection. The set is perfect for display or for use in the cockpit. Don't miss out on this unique piece of aviation history.